How to give constant data in RFC function module

Hello;
    I have created a BAPI which doesnt have any data i want to put some data in that BAPI so tried with constants but it is not working..how put hard code data in function module..when i put the data it gives error stating that 'Function-Pool' should not be the first statement..
Thanks and Regards,
   Om.

HI;
  Ya I did it but still i am facing the same problem...can u just tel me is this right
DATA: Total TYPE p DECIMALS 3.
               CONSTANTS: BEGIN OF sampledata,
                          CARRID TYPE c LENGTH 5 VALUE 'AA',
                          SEATSMAX TYPE i value '600',
                          SEATSOCC TYPE i value '500'.
              CONSTANTS end OF sampledata.
Export
     CARRID = 'AA'
     CURRENCY = 'USD'
     SEATSMAX = '600'
     SEATSOCC = '500'
Total = 100 * ( seatsocc / seatsmax ).

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